I opened up my 14-year-old SY77 synth because the disk drive suffered from the dreaded SY77-disk-drive-syndrome. It was easy to open, and it's very tidy inside. Except for the dust, of which there is a lot. I did vacuum the dust very carefully, but after I took the photos.
About 2/3 of the ICs (chips) seen on the boards are Yamaha's own (YM… and XH…), and I wasn't able to find one bit of information on these chips, so I can only make wild guesses as to their purpose. The remaining ICs are mostly common TTL logic components (SN74…).
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This image, originally posted to Flickr, was reviewed on 10 April 2008 by the administrator or reviewerLoveMovement, who confirmed that it was available on Flickr under the stated license on that date.
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{{Information |Description= I opened up my 14-year-old SY77 synth because the disk drive suffered from the dreaded SY77-disk-drive-syndrome. It was easy to open, and it's very tidy inside. Except for the dust, of which there is a lot. I did vacuum the dus